Naslov
General engineering geological characteristics of the Kaštela (Croatia) flysch deposits

Autori
Pollak, Davor ; Buljan, Renato ; Toševski, Aleksandar

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
The City and its Subterranean Environment, EuroEnGeo Madrid 2008 / - Madrid, 2008, 83-83

Skup
II European Conference of International Association for Engineering Geology

Mjesto i datum
Madrid, Španjolska, 15.09.2008. - 19.09.2008

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
flysch; engineering properties; GSI; weathering; Kaštela

Sažetak
Most of the Eocene flysch clastite bedrocks in the wider area of the city of Kaštela near Split are urbanized and densely populated. Northern parts of the flysch terrain are mainly covered with thin rockfall breccia and other slope material originated from the Mesozoic carbonate overthrust nappe. Therefore, there are very limited possibilities for outcrop research. On the other side, in the last several years geotechnical investigations and construction of infrastructural projects enabled us to identify some engineering geological properties and problems of the flysch complex. The obtained facts and numbers will be incorporated into the Basic Engineering Geological map of Croatia in the scale of 1:100, 000. The flysch in wider area is comprised of limestone breccia, calcirudites, calcarenites, marl, clayey limestones and rarely of large limestone olistolithe blocks. The investigated area is mainly built of marl with local interbedding of calcitic siltstone, calcarenite and clayey limestone. In general, lower part of the apparently 800 m thick flysch complex is dominantly built of coarser grained clastites. According to the available laboratory, geophysical, borehole and limited surface data several conclusions can be made. Based on dominant component at least two flysch types can be identified. Marly type of flysch with dominant properties of marl and clay rich marl with rare coarser grained interbeds, is characterized by mild morphology. More resistant type of flysch with dominant interbeds of coarser grained sediments or with calcite rich marl can be determined thanks to its jutted or steeper morphology. Rapid weathering of the cuttings is one of the biggest engineering problems in the area. It is also evident that the weathering processes are related to mineral content, grain size and distribution of individual components. In the coastal plain, natural weathered zones of marly flysch are regular and gradual. In average, total thickness of the weathered marl is between 1 m and 4 m. It is also evident that in the areas with predominant content of other flysch components weathering zones vary greatly. For all these reasons the GSI classification for heterogeneous rock masses was applied. Following the principles of that classification, rock mass quality of the flysch varies in wide range. The GSI values fluctuate with mineral composition, rate and distribution of individual flysch components.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Rudarstvo, nafta i geološko inženjerstvo

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